diff --git a/BackendTests/Controllers/GameControllerTests.cs b/BackendTests/Controllers/GameControllerTests.cs
index 99dc3d2..93d7265 100644
--- a/BackendTests/Controllers/GameControllerTests.cs
+++ b/BackendTests/Controllers/GameControllerTests.cs
@@ -1,4 +1,59 @@
+using System.Net.WebSockets;
+using System.Reflection;
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Logging;
+using NSubstitute;
+using pacMan.Controllers;
+using pacMan.Game;
+using pacMan.Interfaces;
+using pacMan.Services;
+using pacMan.Utils;
+
 namespace BackendTests.Controllers;
 
-public class GameControllerTests // TODO
-{ }
+public class GameControllerTests
+{
+    private IActionService _actionService = null!;
+    private GameController _controller = null!;
+    private IWebSocketService _webSocketService = null!;
+
+    [SetUp]
+    public void Setup()
+    {
+        _webSocketService = Substitute.For<IWebSocketService>();
+        _actionService = Substitute.For<ActionService>(
+            Substitute.For<ILogger<ActionService>>(), _webSocketService
+        );
+        _controller = new GameController(Substitute.For<ILogger<GameController>>(), _webSocketService, _actionService);
+    }
+
+    [Test]
+    public void Run()
+    {
+        var message = new ActionMessage { Action = (GameAction)(-1), Data = "{\"text\":\"Hello World!\"}" };
+        var data = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(message));
+        var wssResult = new WebSocketReceiveResult(data.Length, WebSocketMessageType.Text, true);
+
+        var runMethod = _controller.GetType().GetMethod("Run", BindingFlags.Instance | BindingFlags.NonPublic);
+
+        if (runMethod is null) Assert.Fail();
+
+        var result = runMethod!.Invoke(_controller, new object[] { wssResult, data });
+
+        if (result is ArraySegment<byte> resultSegment)
+        {
+            Assert.Multiple(() =>
+            {
+                Assert.That(resultSegment, Has.Count.EqualTo(data.Length));
+                Assert.That(Encoding.UTF8.GetString(resultSegment.ToArray()), Is.EqualTo(data.GetString(data.Length)));
+            });
+            // TODO not working, works like a normal method call
+            // _actionService.ReceivedWithAnyArgs().DoAction(default!);
+        }
+        else
+        {
+            Assert.Fail("Result is not an ArraySegment<byte>");
+        }
+    }
+}